Centrifugal coating machine



Feb. 22, 1927.

H. w. PLEISTER CENTRIFUGAL coATINs MACHINE 'Filed April 10, 1922Mfr-2eme;

lla'iei'iiecl Feb. 22, vi927.

A Y y 1,618,779 PATENT oFElcE.

HENRY- W. .PLEISTER, OF WESTFIELD, NliillV JERSEY, ASSIGNOR, BY MESNEASSIGN- I I MENTS, T0 DIAMOND EXPANSION BOLT COMPANY, OIE NEW `YORK, N.Y., A COR- PORATION OF NEW YORK.,

'CENTRI'FUGAL COATING- MACHINE.

Application filed April lo, 1922. serial N6. 551,373.l

rlhis invention relates to rotary extractor apparatus by whichgalvanized metal articles, such as bolts, screws, nails,- etc., arecleaned of any excess spelter immediately after being dipped andv whilethey are still hot, and. before the spelter begins to set, the surpluss-pelterbeing thrown off by cenfrifugal force, the'articles retainingthe thin-- nest -desirable coating, uniformly coating the articlessufficiently to prevent oxidation.

Another advantage of my device is that due to the introduction of asecondary rotation galvanizing container, in which the goods arecarried, the tendency for such articles after' being dipped to clingtogether in an apparently inextricable mass is obviated, and thearticles while in the extractorl are ke ts in constant motion during theprocess of throwing olf the excess'spelter. By this means greatereconomy in the use of spelter is obtained inaslnuch as only a desiredminimum .coating may be permitted to remain upon'the articles, ithavi'ng been found in practice that such minimum isV sufficient toprotect them against ordinary requirements. In addition to theseadvantages my apparatus permits the container in which the articles aretreated to be placed in operative position in the extractorvwith greatfacility and to be leld with flexible rigidity during the centrifugaland whirling motion the containerl goes through, and then as quickly re-Lmoved from the container. By this advan- Utage of quick settingandfastening of vthe article containerl onto the machine, the transfertime of` said articles from the spelter vat to full rotation isfacilitated and the articles are treated while hot, with the lspelterstill' in plastic lcondition.`thereby insurg-A ing the desired removalofthe surplus 'spelter andall dross from the said articles.,

Another advantage is in the means where by the weight of the articlesimthe container to be treated may be quickly and exactly balanced for aperfectly harmonized Another distinct advantage in my device 1s thatowing to the peculiar combined ac tion of the primary and secondaryrotation lof the articles being treated, they are left with a brighterand smoother finish, as all particles of dross are thrown therefromoutwardly from the container, thereby leaving a thin, smooth and brightcoating, without the customary broken and checked surface heretoforeexperienced, especially to be noted upon small articles such as roofingnails, etc. f

A still further advantage of my apparatus consists in the fact that Iprotect the driving belt and gears of the machine entirely 'from' thefalling hot spelter.

Other advantages ofthe invention will appear as vthe descriptionproceeds; and while herein details of the invention are described, theinvention is not limited to these, since many and various changes may bemade without departing from the scope of the invention as claimed. 4

In the accompanying drawing, Fig. 1 is a top plan view of my apparatus.

Fig.' 2 is asectiona-l elevation of the apparatus on the line A-B ofFig. 1.

The apparatus consists of a suitable metal base 1; asupport 2 isfastened to base 1 in which support 2 is ixedly mounted a versoV ticalshaft 3 with a shoulder 4 resting in i support 2 and supporting a thrustball bearing 5, on which rests a driving pulley 6.

7 ixedly supporting a platform table on head 8. i

On top ofpshaft 3, I provide a step 9 on which isfixedly mounted apinion 10 resting- -on cap bearing 11 covering hub 7 of pulley 6 andhuby 12 of head 8, and is .provided with' adequate oil holes (not shown)for oiling the rotating surfaces of hub 7 and pulley 6 around shaft 3 byway of oil grooves 13 provided for. this 'purpose on shaft 3. Y

Radially on one side of head 8, I provide a boscs 14,\l1ollowed, tocontain a thrust ball bearing 15 around stud 16. Stud 16v and ballbearing 15 support gear 17 fixedly mounted on stud 16 freely rotating inhead 8. Gear 17 meshes with pinion 10. The ratio between the primarygearV and secondary pinion is not a fixed ratio. It may IISA `tor band23, a latch be of any value that may be found advisable and depends onthe kind of articles tov be treated, various compounding of ears andpinion ratios being always availa le. The ratio as shown in the drawingis slightly over 3 to l, which means that for one complete revolution ofgear 17 around its axis, that is around stud 16, it has to revolve threeand a fraction times around pinion 10 and shaft 3` A secondary table 18has a hub 19 set in a recess of the upper hub ot (rear 17. Hub 19 isthreaded and screwed tightly on step 2O of stud 16, thus making thetable integral to the gear or vice versa, but detachable one from theother, which is more advisable than making them wholly as a unit. Thesame table serves for any gear when a change of ratio between gear andpinion is needed, which is advantageous in that if each gear had its owntable, each table would also have to possess the means to hold acontainer C of the articles that are to be freed of the excess spelter.

For holding the container C during revolving operation the frame F isprovided, this frame consisting of a circular series of resilientuprights 21 secured to the secondary table and surrounded by the twoseparate polygonal bands 22 of resilient metal, the uprights 21 andbands 22 forming a flexible polygonal member, in the present instance ofhexagonal form, for reoeiving and supporting therein the plontainer Thecontainer C is of cylindrical form and comprises a basket receptacleportion of resilient material, such as strong wire mesh, the meshopenings of which are of a size to permit easyl passage of liquidspelter therethrough from the basket portion, but are not large enoughfor passage of any of the articles being treated. The flexiblereceptacle portion is provided at its top with the rim band 23 to whichis fixedly attached the angle-iron sector band 23', and diametricallyopposite to the secsocket such 'as 24 is secured to the rimband. i

The container C is slidably received in the polygonal member rights 21and bands 22 and is frictionally retained therein, the outer sides ofthe flexible basket portion heilig in contact with the innerlongitudinal faces of the nprights, the flexible basket thus being incontact with the flexible polygonal member, the intention being thatduring rotation of the container, as the tendency of the loose articlestherein under centrifugal force is to iinpact against the interior ofthe container at the outermost points ofV the radii thereof remote fromthe axis of the container, the flexible sides of the, container are thusforced against the uprights 21 which give `formed by the upslightlyunder the impact, but which, due to their resiliency and the springaction of adjacent angular portions of the bands 22 quickly return totheir former positions, the contact of the flexible sides of' thecontainer with the flexible uprights thereby giving the articles ashaking movement whereby the articles therein are thrown apart andprevented from sticking or clinging together or freezing, and the loosespelter is separated and flung from the sides of the basket portion.

The container C is covered bya removable cover 25 with a ring handle 26in the center, and a spring latch bolt 27. Cover 25 is as easily andinstantly placeable onto container C as it is removable. To place it Ipush it under the inwardly protruding member of the sector band 23, thelatch bolt 27 above the latch socket 24:, and then let it Afall ontoithe circular metal band, the bolt automatically engaging into thesocket thereby latching the cover 25 to the container C. To remove thecover 25 all that is required is to push the latch 27 out of the socketand raise the cover by its handle 26.

In apparatuses of this kind where only simple centrifugal motion isemployed to free the galvanized articles of excess speltel, the articlecontainer can only be partially loaded, the contained articles wouldaccumulate against thc side of the container in a ring-like compactnon-movable mass away from the center` which would prevent the easyoutflow of the spelter which would then tend to cool and solidifyythearticles into lumps. This, as explained` is prevented by the combinedsecondary whirling motion of the article container and the primarycentrifugal motion, and the shaking of the container.

` By the combined primary and secondary motion, as noted, the articlesto be treated, and which, as is understood` are coated with a rapidlysetting or solidifying com- Jound. are given a centrifugal action todisf i D charge excess spelter, and the articles in addition are treatedto a secondary axial rotation whereby they are whirled about the axis oftheir orbital centrifugal rotation, thereby constantly turning them overwithin the container and constantly breaking their capillary contactwith one another until no more spelter is discharged therefrom, andthereafter immediately, and bcfore the spelter has set, they are removedfrom 'the machine rapidly by reason of the quickly detachable means Ihave provided and are shaken out into a separate mass into a ,suitablecooling medium in the usual manner. Bv this action it will be seen thateach individual article from the moment of placing into the extractoruntil they have been cooled 1s kept moving relatively t0 its associated.articles, so that there is no opportunity for bunching and thecentrifugal energy acts upon the constantly changing positions andsurfaces of the articles being treated.

In order to variably counterbalance the container C, relative to itsdifferent load contents, a 4metal weight 38 is provided, which isslidable on a -rod 29, with a set screw 30 to adjustably fix it firmlyatany required distance from the center of` vshaft 3 on `said rod 29.'Rod 29 is inserted on a segmental rim 31 provided radially across` boss14 on head 8, and held in firm position.

in rim31 by setscrew 32.' ,A further object of rim 31 istocounterbalance gear 17 and` table 18', s o that counterweight 28 has tocounterbalance container C with its load for different loads. or whendifferent articles in different quantities are to be treated.

My apparatus isenclosed by an open metal housing 33. The object ofthishousing is to prevent the wide scattering of the discharged spelter andto concentrate it into a relatively small space at the bottom of thehousing froln whereit can be collected for remeltng .in the spelter vat.On one side o the housing I provide ,a sheet metal casing 34 extendingunder head 8 near the pulley 5 and wide enough to leave free passage tothe driving belt 35. The object of this casing is not only to protectsaid belt from any thrown olf hot spelter, but to prevent any spelter tobe carried out of the housing by the belt, or to be carried with thebelt between it and the pulley.

The operation of my apparatus is as follows: l

Container C is carried, fully loaded, directly from the spelter vat andplaced in the holder frame F, then eounterbalanced by weight 28. Thisdone, the motive power that drives the apparatus is applied to belt 35which revolves the primary centrifugal head 8 around shaft 3. -Thisforces gear 17 to revolve around pinion 10, which, being stationary,forces `gear 17 to revolve aboutits orbital axis around shaft 3, with aspeed depending on thev ratio between gear and pinion.

The primary centrifugal force imparted to the whole mass in thecontainer, discharges the excess hot, liquid spelter from articles inthe container, which articles, by being subjected to the secondaryrotary agitation and jarring of the container, leave free passagebetween them for the spelter to. reach the side ofthe container and toflow out through the meshes thereof and to be thrown against the side ofthe housing.

It will be noticed that table 18 is fully extended over gear 17 andpinion 10, thereby preventing said gear and pinion from accumulation of,and clogging by, v chilled spelter.

Having thus described my invention, I claim- 1. In apparatus forremoving excess metalv the contents thereofx A 3. In apparatus forremoving excess metal from metal coated articles, the combination with atable; of a support for' said table eccentric thereof, means to impart aplanetary motion to the table, a series of spaced spring. arms extendingupwardly from said table in concentric relation to the axis of thetable, a polygonal spring band having its sides connected to saidarmsadjacent the container removably held in said table within theseries o f arms.

4. In apparatus. for removing excess metal article holder on the tableand shaking of,-

'upper ends of the arms, and a reticulated from metal coated articles,the combination of a support, a head rotatably mounted on said support,a shaft rotatably mounted in said head eccentric to the support,planetary gearing connecting the shaft and support, meansto rotate saidhead, a shiftable counterweightcarried by said head diametricallyopposite the shaft, a table fixed L on said shaft, a skeleton framefixed concentrically on said table, and a reticulated article holderremovably mounted on said support.

5. An apparatus for removing molten excessmetal from-metal coatedarticles, said apparatus comprising an article container having openingsin the sides thereof removably disposed mthe apparatus; and means forimparting planetary motion to said container sufficient to causecentrifugal force to throw through said openings molten metal from metalcoated articles in the container;

`said container and frame being resistant to the heat of molten-metaland articles being galvanized and constructed to permit molten metal topass through said openings.

6. An apparatus for removing molten excess metal from metal coatedarticles, said apparatus comprising a frame; an article container havingopenings in the sides thereof removably disposed in said frame; andmeans for imparting planetary motion to said frame sufficient to causecentrifugal force to -throw through said openings molten zinc from zinccoated articles in the container; said container and frame beingresistant to the centrifugal force exerted by said metal articles, andresistant to the heat of molten zinc and articles being galvanized, andconstructed to permit the molten zinc to pass through said openings.

7. An apparatus for removing molten eX- cess metal from metalcoatedarticles, said apparatus comprising an article container havingyopenings in the sides thereof; a frame constructed for thesubstantially in stantaneous reception of said container to prevent thefreezing of the molten metal before throwing it olf; and means forimparting planetary motion to said frame, with the container therein,suilicient to cause centrifugal force to throw through said openingsmolten metal from metal coated articles in the container; said containerand frame being resistant to the heat of molten metal and articles beinggalvanized and constructed to permit molten metal to pass through saidopenings.

8. An apparatus for removing molten excess metal from metal coatedarticles, said apparatus comprising an article container having openingsin the sides thereof; a frame constructed for the immediate reception ofsaid container when the latter is lowered therein; means for impartingplanetary motion to said frame, with the container and articles therein,suflicient to cause cen trifugal force to throw through said openingsmolten metal from metal coated articles in the container; said containerand frame being strong enough to resist the centrifugal force exerted bysaid metal articles and iesistant to the heat of molten metal andarticles being galvanized and constructed to permit molten metal to passthrough said openings; a housing surrounding said carrier and open atthe top to permit the lowering of said container with the frame; and aremovable cover disposable over said housing.

9. An appa 'atus for removing molten excess metal from metal coatedbolts and similar articles, said apparatus comprising an articlecontainer removably disposed in the apparatus and having openings in thesides thereof large enough to permit molten metal to pass through saidopenings and small enough to prevent the passage of any of saidarticles; and means for imparting planetary motion to said containersufficient to cause centrifugal force to throw through said openingsmolten metal from metal coated articles in the container; said containerbeing strong enough to resist the centrifugal force exerted by saidarticles and resistant to the heat of molten metal and articles beinggalvanized.

l0. An apparatus for removing excess metal from metal coated articles,said apparatus comprising a frame; a perforated container for thearticles disposable in said frame; and means for imparting planetarymotion to said frame whereby centrifugal force of oppositely varyingdirections relative to the frame is imparted to said articles, wherebythe articles are thrown from side to side of the container; said frameincluding resilient means for absorbing the shocks caused by saidarticles when being thus thrown.

HENRY W. PLEISTER.

